Capture
Seizure
noun, verbal noun
To catch and seize is capture and seizure.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
このメモ帳に、巨人の捕獲についての思いついたことを全部メモしています。
In this memo pad, I’ve kept notes on all my ideas for capturing titans.